Understanding of Hydrotreating on Unsupported Ni-Mo, Ni-W and Ni-Mo-W Sulfides

CATEGORY: HYDROTREATING
23rd North American Catalysis Society Meeting, June 2-7, 2013, Louisville, Kentucky
Understanding of Hydrotreating on Unsupported Ni-Mo, Ni-W and Ni-Mo-W Sulfides
Jennifer Hein (1), Oliver Y. Gutiérrez (1), Jinyi Han (2), Johannes A. Lercher (1)*
johannes.lercher@ch.tum.de
1 Technical University Munich, Department of Chemistry, Catalysis Research Center, 85747 Garching, Germany
2 Chevron Energy Technology Company, Richmond, 94802 CA, USA
Introduction
Catalysts based on Mo and W sulfides are well known for their high activity in removal of heteroatoms from hydrocarbons. These, Ni(Co)-promoted MoS2 and WS2 catalysts are used in large scale in hydrotreating processes typically supported on alumina. However since 2001, exceptionally high active unsupported mixed metal sulfides were successfully applied in refineries, triggering interest in unsupported sulfide catalysts. These materials allow exploring the surface chemistry and catalysis without carrier effects. Only few structural models have been proposed  and structure-activity correlations have been little understood, despite of abundant characterization results of bi- and multimetallic unsupported sulfides and various applications in hydrotreating reactions. Therefore, we aim to investigate hydrotreating properties as function of chemical and structural parameters. The emphasis is laid on the catalytic function and interaction among the different metal sulfides by studying unsupported Mo-Ni, W-Ni and Mo-W-Ni sulfide materials.
Significance
The results of this work enable the design of highly active sulfide catalyst with specific hydrotreating properties by elucidating the role of the phases present and the interaction among them.
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